baccatin 1/taxus cuspidata

In order to study the active constituents in the stem barks of Taxus cuspidata Sieb. et Zucc., led to the isolation and structural determination of three compounds. On the basis of chemical evidences and spectral analysis (UV, IR, 1HNMR, 13CNMR and FAB-MS,) the structures of I, II and III were

Ten known taxoids, paclitaxel, 7-epi-taxol, taxol C, baccatin VI, taxayuntin C, taxuyunnanine C and its analogues (2-5), and yunnanxane (6), and an abietane, taxamairin A, were produced in the callus culture of Taxus cuspidata cultivated on a modified Gamborg's B5 medium in the presence of 0.5 mg/L